<script setup lang="ts">
import { computed, onActivated, onMounted, ref, watch } from 'vue';

// 定义水果对象的类型
interface Fruit {
    id: number
    icon: string
    isChecked: boolean
    num: number
    price: number
}

// 水果列表
const fruitList = ref<Fruit[]>([
    {
        id: 1,
        icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/ll.png',
        isChecked: false,
        num: 2,
        price: 6,
    },
    {
        id: 2,
        icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/smt.png',
        isChecked: false,
        num: 7,
        price: 20,
    },
    {
        id: 3,
        icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/tg.png',
        isChecked: false,
        num: 3,
        price: 40,
    },
    {
        id: 4,
        icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/xg.png',
        isChecked: false,
        num: 10,
        price: 3,
    },
    {
        id: 5,
        icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/yl.png',
        isChecked: false,
        num: 20,
        price: 34,
    },
])

onMounted(() => {
    getDataFromStorage()
})
//从本地存储中读取数据
const getDataFromStorage = () => {
    const str = localStorage.getItem("fruit")
    if (str) {
        const parseObj = JSON.parse(str) as Fruit[]
        if (parseObj.length) {
            fruitList.value = parseObj
        }
    }
}
//删除方法
const delFruit = (id: number) => {
    //方法1：
    const index = fruitList.value.findIndex(item => item.id === id)
    if (index > -1) {
        fruitList.value.splice(index, 1)
    }
    //方法2：
    // fruitList.value = fruitList.value.filter(item => item.id !== id)
}
// 计算属性 - 全选-> 所有的勾选 - 有一个变化 -> 全选
const isAllChecked = computed({
    //fruitList中任何一项的勾选发生变化都会执行
    get() {
        return fruitList.value.every(item => item.isChecked)
    },
    //点击全选按钮时执行
    set(value: boolean) {
        fruitList.value.forEach(item => {
            item.isChecked = value
        })
    }
})
//筛选出已选择的商品
const selectFruits = computed(() => fruitList.value.filter(item => item.isChecked))
//计算筛选出商品的总数量
const allCount = computed(() => selectFruits.value.reduce((preValue, item) => preValue + item.num, 0))
//计算筛选出商品的总价
const allPrice = computed(() => selectFruits.value.reduce((preValue, item) => preValue + item.num * item.price, 0))

//持久化处理
watch(fruitList, (newArr) => {
    localStorage.setItem("fruit", JSON.stringify(fruitList.value))
}, {
    deep: true
})
</script>

<template>
    <div class="app-container" id="app">
        <!-- 顶部banner -->
        <div class="banner-box"><img src="https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/sg_top.png" alt="" />
        </div>
        <!-- 面包屑 -->
        <div class="breadcrumb">
            <span>🏠</span>
            /
            <span>购物车</span>
        </div>
        <!-- 购物车主体 -->
        <div class="main" v-if="fruitList.length">
            <div class="table">
                <!-- 头部 -->
                <div class="thead">
                    <div class="tr">
                        <div class="th">选中</div>
                        <div class="th th-pic">图片</div>
                        <div class="th">单价</div>
                        <div class="th num-th">个数</div>
                        <div class="th">小计</div>
                        <div class="th">操作</div>
                    </div>
                </div>
                <!-- 身体 -->
                <div class="tbody">
                    <div class="tr active" v-for="(item, index) in fruitList" :key="item.id">
                        <div class="td"><input type="checkbox" v-model="item.isChecked" /></div>
                        <!-- <div class="td"><input type="checkbox" :checked="item.isChecked" /></div> -->
                        <div class="td"><img :src="item.icon" alt="" />
                        </div>
                        <div class="td">{{ item.price }}</div>
                        <div class="td">
                            <div class="my-input-number">
                                <button class="decrease" :disabled="item.num <= 1" @click="item.num--"> - </button>
                                <span class="my-input__inner">{{ item.num }}</span>
                                <button class="increase" @click="item.num++"> + </button>
                            </div>
                        </div>
                        <div class="td">{{ item.num * item.price }}</div>
                        <div class="td"><button @click="delFruit(item.id)">删除</button></div>
                    </div>
                </div>
            </div>
            <!-- 底部 -->
            <div class="bottom">
                <!-- 全选 -->
                <label class="check-all">
                    <input type="checkbox" v-model="isAllChecked" />
                    全选
                </label>
                <div class="right-box">
                    <!-- 所有商品总价 -->
                    <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{ allPrice
                            }}</span></span>
                    <!-- 结算按钮 -->
                    <button class="pay">结算( {{ allCount }} )</button>
                </div>
            </div>
        </div>
        <!-- 空车 -->
        <div class="empty" v-else>🛒空空如也</div>
    </div>
</template>

<style scoped>
@import '../style/inputnumber.css';
@import '../style/index.css';
</style>